1 #ifndef _SPARC_PGTABLE_H 2 #define _SPARC_PGTABLE_H 3 4 /* asm/pgtable.h: Defines and functions used to work 5 * with Sparc page tables. 6 * 7 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 8 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 9 */ 10 11 #include <linux/const.h> 12 13 #ifndef __ASSEMBLY__ 14 #include <asm-generic/4level-fixup.h> 15 16 #include <linux/spinlock.h> 17 #include <linux/swap.h> 18 #include <asm/types.h> 19 #include <asm/pgtsrmmu.h> 20 #include <asm/vaddrs.h> 21 #include <asm/oplib.h> 22 #include <asm/cpu_type.h> 23 24 25 struct vm_area_struct; 26 struct page; 27 28 extern void load_mmu(void); 29 extern unsigned long calc_highpages(void); 30 31 #define pte_ERROR(e) __builtin_trap() 32 #define pmd_ERROR(e) __builtin_trap() 33 #define pgd_ERROR(e) __builtin_trap() 34 35 #define PMD_SHIFT 22 36 #define PMD_SIZE (1UL << PMD_SHIFT) 37 #define PMD_MASK (~(PMD_SIZE-1)) 38 #define PMD_ALIGN(__addr) (((__addr) + ~PMD_MASK) & PMD_MASK) 39 #define PGDIR_SHIFT SRMMU_PGDIR_SHIFT 40 #define PGDIR_SIZE SRMMU_PGDIR_SIZE 41 #define PGDIR_MASK SRMMU_PGDIR_MASK 42 #define PTRS_PER_PTE 1024 43 #define PTRS_PER_PMD SRMMU_PTRS_PER_PMD 44 #define PTRS_PER_PGD SRMMU_PTRS_PER_PGD 45 #define USER_PTRS_PER_PGD PAGE_OFFSET / SRMMU_PGDIR_SIZE 46 #define FIRST_USER_ADDRESS 0 47 #define PTE_SIZE (PTRS_PER_PTE*4) 48 49 #define PAGE_NONE SRMMU_PAGE_NONE 50 #define PAGE_SHARED SRMMU_PAGE_SHARED 51 #define PAGE_COPY SRMMU_PAGE_COPY 52 #define PAGE_READONLY SRMMU_PAGE_RDONLY 53 #define PAGE_KERNEL SRMMU_PAGE_KERNEL 54 55 /* Top-level page directory */ 56 extern pgd_t swapper_pg_dir[1024]; 57 58 extern void paging_init(void); 59 60 extern unsigned long ptr_in_current_pgd; 61 62 /* xwr */ 63 #define __P000 PAGE_NONE 64 #define __P001 PAGE_READONLY 65 #define __P010 PAGE_COPY 66 #define __P011 PAGE_COPY 67 #define __P100 PAGE_READONLY 68 #define __P101 PAGE_READONLY 69 #define __P110 PAGE_COPY 70 #define __P111 PAGE_COPY 71 72 #define __S000 PAGE_NONE 73 #define __S001 PAGE_READONLY 74 #define __S010 PAGE_SHARED 75 #define __S011 PAGE_SHARED 76 #define __S100 PAGE_READONLY 77 #define __S101 PAGE_READONLY 78 #define __S110 PAGE_SHARED 79 #define __S111 PAGE_SHARED 80 81 extern int num_contexts; 82 83 /* First physical page can be anywhere, the following is needed so that 84 * va-->pa and vice versa conversions work properly without performance 85 * hit for all __pa()/__va() operations. 86 */ 87 extern unsigned long phys_base; 88 extern unsigned long pfn_base; 89 90 /* 91 * BAD_PAGETABLE is used when we need a bogus page-table, while 92 * BAD_PAGE is used for a bogus page. 93 * 94 * ZERO_PAGE is a global shared page that is always zero: used 95 * for zero-mapped memory areas etc.. 96 */ 97 extern pte_t * __bad_pagetable(void); 98 extern pte_t __bad_page(void); 99 extern unsigned long empty_zero_page; 100 101 #define BAD_PAGETABLE __bad_pagetable() 102 #define BAD_PAGE __bad_page() 103 #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) 104 105 /* 106 * In general all page table modifications should use the V8 atomic 107 * swap instruction. This insures the mmu and the cpu are in sync 108 * with respect to ref/mod bits in the page tables. 109 */ 110 static inline unsigned long srmmu_swap(unsigned long *addr, unsigned long value) 111 { 112 __asm__ __volatile__("swap [%2], %0" : "=&r" (value) : "0" (value), "r" (addr)); 113 return value; 114 } 115 116 /* Certain architectures need to do special things when pte's 117 * within a page table are directly modified. Thus, the following 118 * hook is made available. 119 */ 120 121 static inline void set_pte(pte_t *ptep, pte_t pteval) 122 { 123 srmmu_swap((unsigned long *)ptep, pte_val(pteval)); 124 } 125 126 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) 127 128 static inline int srmmu_device_memory(unsigned long x) 129 { 130 return ((x & 0xF0000000) != 0); 131 } 132 133 static inline struct page *pmd_page(pmd_t pmd) 134 { 135 if (srmmu_device_memory(pmd_val(pmd))) 136 BUG(); 137 return pfn_to_page((pmd_val(pmd) & SRMMU_PTD_PMASK) >> (PAGE_SHIFT-4)); 138 } 139 140 static inline unsigned long pgd_page_vaddr(pgd_t pgd) 141 { 142 if (srmmu_device_memory(pgd_val(pgd))) { 143 return ~0; 144 } else { 145 unsigned long v = pgd_val(pgd) & SRMMU_PTD_PMASK; 146 return (unsigned long)__nocache_va(v << 4); 147 } 148 } 149 150 static inline int pte_present(pte_t pte) 151 { 152 return ((pte_val(pte) & SRMMU_ET_MASK) == SRMMU_ET_PTE); 153 } 154 155 static inline int pte_none(pte_t pte) 156 { 157 return !pte_val(pte); 158 } 159 160 static inline void __pte_clear(pte_t *ptep) 161 { 162 set_pte(ptep, __pte(0)); 163 } 164 165 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) 166 { 167 __pte_clear(ptep); 168 } 169 170 static inline int pmd_bad(pmd_t pmd) 171 { 172 return (pmd_val(pmd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; 173 } 174 175 static inline int pmd_present(pmd_t pmd) 176 { 177 return ((pmd_val(pmd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); 178 } 179 180 static inline int pmd_none(pmd_t pmd) 181 { 182 return !pmd_val(pmd); 183 } 184 185 static inline void pmd_clear(pmd_t *pmdp) 186 { 187 int i; 188 for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) 189 set_pte((pte_t *)&pmdp->pmdv[i], __pte(0)); 190 } 191 192 static inline int pgd_none(pgd_t pgd) 193 { 194 return !(pgd_val(pgd) & 0xFFFFFFF); 195 } 196 197 static inline int pgd_bad(pgd_t pgd) 198 { 199 return (pgd_val(pgd) & SRMMU_ET_MASK) != SRMMU_ET_PTD; 200 } 201 202 static inline int pgd_present(pgd_t pgd) 203 { 204 return ((pgd_val(pgd) & SRMMU_ET_MASK) == SRMMU_ET_PTD); 205 } 206 207 static inline void pgd_clear(pgd_t *pgdp) 208 { 209 set_pte((pte_t *)pgdp, __pte(0)); 210 } 211 212 /* 213 * The following only work if pte_present() is true. 214 * Undefined behaviour if not.. 215 */ 216 static inline int pte_write(pte_t pte) 217 { 218 return pte_val(pte) & SRMMU_WRITE; 219 } 220 221 static inline int pte_dirty(pte_t pte) 222 { 223 return pte_val(pte) & SRMMU_DIRTY; 224 } 225 226 static inline int pte_young(pte_t pte) 227 { 228 return pte_val(pte) & SRMMU_REF; 229 } 230 231 /* 232 * The following only work if pte_present() is not true. 233 */ 234 static inline int pte_file(pte_t pte) 235 { 236 return pte_val(pte) & SRMMU_FILE; 237 } 238 239 static inline int pte_special(pte_t pte) 240 { 241 return 0; 242 } 243 244 static inline pte_t pte_wrprotect(pte_t pte) 245 { 246 return __pte(pte_val(pte) & ~SRMMU_WRITE); 247 } 248 249 static inline pte_t pte_mkclean(pte_t pte) 250 { 251 return __pte(pte_val(pte) & ~SRMMU_DIRTY); 252 } 253 254 static inline pte_t pte_mkold(pte_t pte) 255 { 256 return __pte(pte_val(pte) & ~SRMMU_REF); 257 } 258 259 static inline pte_t pte_mkwrite(pte_t pte) 260 { 261 return __pte(pte_val(pte) | SRMMU_WRITE); 262 } 263 264 static inline pte_t pte_mkdirty(pte_t pte) 265 { 266 return __pte(pte_val(pte) | SRMMU_DIRTY); 267 } 268 269 static inline pte_t pte_mkyoung(pte_t pte) 270 { 271 return __pte(pte_val(pte) | SRMMU_REF); 272 } 273 274 #define pte_mkspecial(pte) (pte) 275 276 #define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot) 277 278 static inline unsigned long pte_pfn(pte_t pte) 279 { 280 if (srmmu_device_memory(pte_val(pte))) { 281 /* Just return something that will cause 282 * pfn_valid() to return false. This makes 283 * copy_one_pte() to just directly copy to 284 * PTE over. 285 */ 286 return ~0UL; 287 } 288 return (pte_val(pte) & SRMMU_PTE_PMASK) >> (PAGE_SHIFT-4); 289 } 290 291 #define pte_page(pte) pfn_to_page(pte_pfn(pte)) 292 293 /* 294 * Conversion functions: convert a page and protection to a page entry, 295 * and a page entry and page directory to the page they refer to. 296 */ 297 static inline pte_t mk_pte(struct page *page, pgprot_t pgprot) 298 { 299 return __pte((page_to_pfn(page) << (PAGE_SHIFT-4)) | pgprot_val(pgprot)); 300 } 301 302 static inline pte_t mk_pte_phys(unsigned long page, pgprot_t pgprot) 303 { 304 return __pte(((page) >> 4) | pgprot_val(pgprot)); 305 } 306 307 static inline pte_t mk_pte_io(unsigned long page, pgprot_t pgprot, int space) 308 { 309 return __pte(((page) >> 4) | (space << 28) | pgprot_val(pgprot)); 310 } 311 312 #define pgprot_noncached pgprot_noncached 313 static inline pgprot_t pgprot_noncached(pgprot_t prot) 314 { 315 prot &= ~__pgprot(SRMMU_CACHE); 316 return prot; 317 } 318 319 static pte_t pte_modify(pte_t pte, pgprot_t newprot) __attribute_const__; 320 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) 321 { 322 return __pte((pte_val(pte) & SRMMU_CHG_MASK) | 323 pgprot_val(newprot)); 324 } 325 326 #define pgd_index(address) ((address) >> PGDIR_SHIFT) 327 328 /* to find an entry in a page-table-directory */ 329 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address)) 330 331 /* to find an entry in a kernel page-table-directory */ 332 #define pgd_offset_k(address) pgd_offset(&init_mm, address) 333 334 /* Find an entry in the second-level page table.. */ 335 static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address) 336 { 337 return (pmd_t *) pgd_page_vaddr(*dir) + 338 ((address >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); 339 } 340 341 /* Find an entry in the third-level page table.. */ 342 pte_t *pte_offset_kernel(pmd_t * dir, unsigned long address); 343 344 /* 345 * This shortcut works on sun4m (and sun4d) because the nocache area is static. 346 */ 347 #define pte_offset_map(d, a) pte_offset_kernel(d,a) 348 #define pte_unmap(pte) do{}while(0) 349 350 struct seq_file; 351 void mmu_info(struct seq_file *m); 352 353 /* Fault handler stuff... */ 354 #define FAULT_CODE_PROT 0x1 355 #define FAULT_CODE_WRITE 0x2 356 #define FAULT_CODE_USER 0x4 357 358 #define update_mmu_cache(vma, address, ptep) do { } while (0) 359 360 void srmmu_mapiorange(unsigned int bus, unsigned long xpa, 361 unsigned long xva, unsigned int len); 362 void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len); 363 364 /* Encode and de-code a swap entry */ 365 static inline unsigned long __swp_type(swp_entry_t entry) 366 { 367 return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; 368 } 369 370 static inline unsigned long __swp_offset(swp_entry_t entry) 371 { 372 return (entry.val >> SRMMU_SWP_OFF_SHIFT) & SRMMU_SWP_OFF_MASK; 373 } 374 375 static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) 376 { 377 return (swp_entry_t) { 378 (type & SRMMU_SWP_TYPE_MASK) << SRMMU_SWP_TYPE_SHIFT 379 | (offset & SRMMU_SWP_OFF_MASK) << SRMMU_SWP_OFF_SHIFT }; 380 } 381 382 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) 383 #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) 384 385 /* file-offset-in-pte helpers */ 386 static inline unsigned long pte_to_pgoff(pte_t pte) 387 { 388 return pte_val(pte) >> SRMMU_PTE_FILE_SHIFT; 389 } 390 391 static inline pte_t pgoff_to_pte(unsigned long pgoff) 392 { 393 return __pte((pgoff << SRMMU_PTE_FILE_SHIFT) | SRMMU_FILE); 394 } 395 396 /* 397 * This is made a constant because mm/fremap.c required a constant. 398 */ 399 #define PTE_FILE_MAX_BITS 24 400 401 /* 402 */ 403 struct ctx_list { 404 struct ctx_list *next; 405 struct ctx_list *prev; 406 unsigned int ctx_number; 407 struct mm_struct *ctx_mm; 408 }; 409 410 extern struct ctx_list *ctx_list_pool; /* Dynamically allocated */ 411 extern struct ctx_list ctx_free; /* Head of free list */ 412 extern struct ctx_list ctx_used; /* Head of used contexts list */ 413 414 #define NO_CONTEXT -1 415 416 static inline void remove_from_ctx_list(struct ctx_list *entry) 417 { 418 entry->next->prev = entry->prev; 419 entry->prev->next = entry->next; 420 } 421 422 static inline void add_to_ctx_list(struct ctx_list *head, struct ctx_list *entry) 423 { 424 entry->next = head; 425 (entry->prev = head->prev)->next = entry; 426 head->prev = entry; 427 } 428 #define add_to_free_ctxlist(entry) add_to_ctx_list(&ctx_free, entry) 429 #define add_to_used_ctxlist(entry) add_to_ctx_list(&ctx_used, entry) 430 431 static inline unsigned long 432 __get_phys (unsigned long addr) 433 { 434 switch (sparc_cpu_model){ 435 case sun4m: 436 case sun4d: 437 return ((srmmu_get_pte (addr) & 0xffffff00) << 4); 438 default: 439 return 0; 440 } 441 } 442 443 static inline int 444 __get_iospace (unsigned long addr) 445 { 446 switch (sparc_cpu_model){ 447 case sun4m: 448 case sun4d: 449 return (srmmu_get_pte (addr) >> 28); 450 default: 451 return -1; 452 } 453 } 454 455 extern unsigned long *sparc_valid_addr_bitmap; 456 457 /* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ 458 #define kern_addr_valid(addr) \ 459 (test_bit(__pa((unsigned long)(addr))>>20, sparc_valid_addr_bitmap)) 460 461 /* 462 * For sparc32&64, the pfn in io_remap_pfn_range() carries <iospace> in 463 * its high 4 bits. These macros/functions put it there or get it from there. 464 */ 465 #define MK_IOSPACE_PFN(space, pfn) (pfn | (space << (BITS_PER_LONG - 4))) 466 #define GET_IOSPACE(pfn) (pfn >> (BITS_PER_LONG - 4)) 467 #define GET_PFN(pfn) (pfn & 0x0fffffffUL) 468 469 extern int remap_pfn_range(struct vm_area_struct *, unsigned long, unsigned long, 470 unsigned long, pgprot_t); 471 472 static inline int io_remap_pfn_range(struct vm_area_struct *vma, 473 unsigned long from, unsigned long pfn, 474 unsigned long size, pgprot_t prot) 475 { 476 unsigned long long offset, space, phys_base; 477 478 offset = ((unsigned long long) GET_PFN(pfn)) << PAGE_SHIFT; 479 space = GET_IOSPACE(pfn); 480 phys_base = offset | (space << 32ULL); 481 482 return remap_pfn_range(vma, from, phys_base >> PAGE_SHIFT, size, prot); 483 } 484 485 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS 486 #define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \ 487 ({ \ 488 int __changed = !pte_same(*(__ptep), __entry); \ 489 if (__changed) { \ 490 set_pte_at((__vma)->vm_mm, (__address), __ptep, __entry); \ 491 flush_tlb_page(__vma, __address); \ 492 } \ 493 __changed; \ 494 }) 495 496 #include <asm-generic/pgtable.h> 497 498 #endif /* !(__ASSEMBLY__) */ 499 500 #define VMALLOC_START _AC(0xfe600000,UL) 501 #define VMALLOC_END _AC(0xffc00000,UL) 502 503 /* We provide our own get_unmapped_area to cope with VA holes for userland */ 504 #define HAVE_ARCH_UNMAPPED_AREA 505 506 /* 507 * No page table caches to initialise 508 */ 509 #define pgtable_cache_init() do { } while (0) 510 511 #endif /* !(_SPARC_PGTABLE_H) */ 512